Inversion Location Research Of Surface Micro-seismic Event

With the deep research of oil and gas exploration,the requirement is more and more meticulous,the micro-seismic technology is a new geophysical technology developed on the basis of seismology and acoustic emission and applied in engineering field.The main principle of micro-seismic monitoring is the use of hydraulic fracturing and high energy gas fracturing fracturing,fracturing on the target horizon,the target horizon surrounding rock under the action of the stress rupture,causing minor earthquakes,namely micro earthquake.By using the seismic wave information received by the geophone,the location of the micro seismic source can be retrieved.This paper studied a variety of inversion methods,considering the advantages and disadvantages of these methods,and ultimately determine the forward method using threedimensional piecewise,and simulation method and tabu search algorithm using the grid inversion method,and write out the algorithm procedures and functions of interface program is inversion method using VC++6.0 and Qt.This paper established a number of threedimensional geological model,set the initial focal point,ray tracing using three-dimensional piecewise iterative algorithm,the 3D ray path multiple model,and then use the ray path of grid simulation inversion of the source location,and compare the two earthquake source points difference.In the study of the actual micro-seismic source localization,the tabu search method is used to locate the inversion.First,a suitable geological model is established,and a ray tracing method is used to obtain the ray path.Then,the tabu search is used to find the location of the source.Finally this method is applied to micro seismic source location in the established geological model suitable for seismic data using the actual source inversion,and using tabu search algorithm for the actual,get a series of focal point.The location and the shape of the cracks can be obtained by the distribution of these points.And the reliability is analyzed,which verifies the reliability of the inversion method in practical application.